Solid wall Victorian house in Conservation Area - 80% carbon emission reduction through whole house upgrade approach using innovative technologies
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as PDF Existing: Solid brick walls; pitched & monopitch tiled roofs; original sash windows; Proposed: External walls insulated & dry lined; Roof insulation increased to 350mm; Insulation inserted below hall, living & dining room floors; Front windows modified to take vacuum glass; New sash windows to rear elevations; High efficiency gas boiler with flue gas heat recovery serving radiators; LED lights, 50k hours guaranteed max light output; sun pipes to f/floor landing; Split vent system with decentralised whole house vent in the rear & natural vent via chimney flues in the front; 2.8kWp PV and 3.0m2 thermal panels; Shower water heat recovery; Reduced water consumption; Smoke alarm systems; AA++ appliances; Smart metering with display
Retrofit for the future ZA125G
Solid wall Victorian house in Conservation Area - 80% carbon emission reduction through whole house upgrade approach using innovative technologies : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | 2861 kWh/yr | 1613 kWh/yr | 4941 kWh/yr |
|---|---|---|---|
| Natural gas use | 34933 kWh/yr | 10218 kWh/yr | 9628 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 541 kWh/m².yr | 181 kWh/m².yr | 268 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 102 kg CO₂/m².yr | 35 kg CO₂/m².yr | 56 kg CO₂/m².yr |
| Annual space heat demand | - | 88 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| 2.8kWp equivalent PV-T | 2233.280029 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 117 kWh/m².yr | 268 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 20 kg CO₂/m².yr | 56 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 01 January 2011 | 8.88m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 31 December 2012 | 8.95m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 16 April 2010 |
| Location | London London England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Solid Brick |
| Other construction type | |
| Party wall construction | 215mm solid brick plastered both sides |
| Floor area | 87.4 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | East Thames Homes |
|---|---|
| Project lead person | East Thames Homes |
| Landlord or Client | East Thames Homes |
| Architect | PRP Architects |
| Mechanical & electrical consultant | N/A |
| Energy consultant | PRP Environmental |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | CDM Coordinator: PRP Project Services |
| Contractor | Hill Partnerships Ltd |
Design strategies
| Planned occupancy | Currently occupied by an elderly lady, but with potential for a family with three children. |
|---|---|
| Space heating strategy | Gas fired boiler with flue gas heat recovery. |
| Water heating strategy | Solar hot water with gas condensing boiler back up. |
| Fuel strategy | Gas heating; Solar thermal hot water with mains gas back up, PV panels and mains electricity |
| Renewable energy strategy | 2.8kWp (23.3sq.m) polycrystaline photovoltaic array and 3.0sq.m solar thermal |
| Passive Solar strategy | The house is in a Conservation Area in a tight urbam location facing north. The rear south facing rooms ( but not the roof ) are shaded by adjacent buildings until mid afternoon. Overheating is unlikely to be an issue. Because of the historic context, windows will remain as traditional sliding sashes, proportionally small for external the wall area. |
| Space cooling strategy | Natural ventilation via openable windows; a hall and landing running for most of the depth of the house on the shaded side will allow through ventilation and cooling. |
| Daylighting strategy | Due to the historic setting window openings will remain as existing. Sun pipes are proposed to illuminate the first floor landing. |
| Ventilation strategy | Natural ventilation via openable windows. A partial decentralised whole house ventilation system is proposed for the rear part of the house to the south of the central staircase, with continuously running low energy fans drawing air out through kitchen and bathroom. In the front part of the house, to the north of the staircase existing chimney flues will be utilised to provide passive stack ventilation assisted by chimney pot cowls. |
| Airtightness strategy | Opportunities will be taken to follow best practice with respect to air tightness and ventilation. Air tightness through floors addressed when insulating the ground floor and installing lights at first floor. Improved seals around new and refurbished windows and doors. Draught sealing around loft hatch. Careful attention to detail and sealing joints when installing dry lining. Ventilation equipment checked for air leakage prior to commissioning and careful detailing around sockets and all other penetrations. Instruction to operatives on best practice at contract stage. Air proof films are not proposed due to the risk of sweating and mould growth. |
| Strategy for minimising thermal bridges | Minimisation of thermal bridges at design stage by careful detailing of all material and component junctions to ensure continuity of insulation and thermal performance. Continuation of dry lining along internal return walls. Insulation of suspended ground floor and exposed areas of first floor and ensuring continuation of insulation wherever possible. Instruction to operatives on best practice and careful site monitoring during construction. |
| Modelling strategy | Whole house modelling was undertaken using SAP (with NHER Plan Assessor software) in conjunction with the Extended SAP worksheet. AutoCAD produced plans and elevations were used to assist with visualisation and detailed design. |
| Insulation strategy | Ground floor - 150mm phenolic foam to U-value 0.17 W/m2K Exposed walls - 50mm Nanogel internal insulation to U-value 0.23 W/m2K Pitched roofs with flat ceiling - Top up to 350mm mineral fibre quilt Resultant U-value 0.12 W/m2K Windows - Pilkington Spacia vacuum glazing in new sashes or replacement uPVC double glazed low-e to U-value 1.1 W/m2K Doors - Replacement uPVC with triple glazed low-e to U-value 1.5 W/m2K |
| Other relevant retrofit strategies | Our proposals are designed to be carried out with the present resident remaining in occupation. Considering the wider application of Retrofit it will be neither practical nor economically viable on a large scale to decant residents while the work is in progress. Pre commencement discussion and engagement with residents, plus regular monitoring during and after the works, will help to minimise the degree of inevitable inconvenience. |
| Contextual information | The historic nature and context of this house, it's position fronting directly onto the street and the proximity of adjacent buildings have played a key part in the selection of material and renewable technologies. We believe our proposals demonstrate an approach which will be applicable to other historic buildings in urban areas. |
Building services
| Occupancy | |
|---|---|
| Space heating | |
| Hot water | |
| Ventilation | |
| Controls | |
| Cooking | |
| Lighting | |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | |
| Roof U-value | 0.00 W/m² K |
| Walls description | |
| Walls U-value | 0.00 W/m² K |
| Party walls description | |
| Party walls U-value | 0.00 W/m² K |
| Floor description | |
| Floor U-value | 0.00 W/m² K |
| Glazed doors description | |
| Glazed doors U-value | 0.00 W/m² K - |
| Opaque doors description | |
| Opaque doors U-value | 0.00 W/m² K - |
| Windows description | |
| Windows U-value | 0.00 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | - |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | 0.00 W/m² K |